Comfortmaker Inducer Motor Bearing Failure or Blocked Draft Path

Furnace produces a high-pitched whine or loud rumbling from the inducer area.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Worn bearings in Comfortmaker inducer motor, Debris in inducer wheel, Partially blocked flue or intake, Loose inducer mounting screws

How to Fix / Troubleshooting

Safety: Turn off power and gas before removing inducer or vent components. Exhaust gases can be hazardous.

Steps:

  • Inspect inducer mounting: Check that all screws securing the inducer to the furnace are tight.
  • Check vent connections: Ensure vent pipes are properly glued or screwed and not vibrating against framing.
  • Spin inducer wheel: With power off, remove the inducer cover (if accessible) and gently spin the wheel. Grinding or stiffness indicates bearing failure.

When to call a technician: Inducer replacement and vent diagnostics should be done by a professional to ensure safe combustion and venting.

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Repair Difficulty

Hard 4/5

Required Part

Inducer Motor Assembly
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